Two forms of inputs can be applied to the Parallel Inputs connector: Voltage Inputs, and
Contact Closures. When a specific input on the V16Pro is software configured for
Voltage Inputs, power for the connection is provided by an external source (in-rack
power supply etc.), but when the input is configured as a Contact Closure, power is taken
internally from the V16Pro.
Voltage Inputs vs. Contact Closures
The main reason for selecting one type in input over the other comes down to the distance
the contact closure is from the unit. There are other reasons as well and the pros and cons
are listed below.
Using Voltage Inputs over Contact Closures (Switches) will add additional complexity to
the installation but provide greater distance.
1. PRO – The installer can overcome long distances when connecting contact closures.
By using higher voltage sources, installers can compensate for resistance in
wiring.
CON – The installer must provide a power source for the contact closure(s).
2. PRO – Inputs can be completely isolated from one another.
CON –An external power supply is needed
Using Contact Closures over Voltage Inputs provides a simple installation but is limited
in distance.
1. PRO – Contact closure installations require only wiring and contacts
CON – The contact closure must be located close (10-20 ft) from the unit.
2. PRO – No external power supply is needed.
CON – The wiring will not be isolated; therefore, errors and problems in any circuit
could affect all contact closures. A high voltage short to this wiring could
damage the V16Pro.
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